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Holyhead Dolphin Piles

Holyhead Terminals 3 and 4

Stena Line awarded Seacore the contract to extend Terminal 3 at Holyhead to facilitate the introduction of the Irish Ferries' vessel Ulysses for the Holyhead - Dublin route.

This project included the supply and installation of 3 additional monopile dolphins along with the structural steel and reinforced concrete pile top platforms, fendering systems, quick release hooks, access walkways and ladderways. The works had to be constructed on a live berth with the Irish Ferries RoRo vessel Inishmore berthing twice a day.

All the construction works were undertaken from Seacore’s jack-up platform Deep Diver and Teredo 8 and Teredo 40 pile top drills, to form rock sockets in the underlying schist bedrock.

Both the reinforced concrete and steel pile top platforms were manufactured on the quayside and lifted into position using the heavy lift, floating crane, Mersey Mammoth . The quick release hooks were anchored in in-situ concrete placed in the upper section of each monopile.

During the course of the project the following additional works on Terminal 4 were awarded to Seacore. This terminal also remained as a live berth during the course of the construction works:

  • The supply and installation of monopile Dolphin OB2 to replace an existing damaged multipile dolphin; these works included the installation of heavy duty fendering, a pile top platform and general construction works.
  • The supply and installation of a further two monopiles to extend Terminal 4 to receive the Stenaline vessel Stena Forwarder . These works also included the supply and installation of torsion arm fendering, further access walkways, steel platforms and general construction works.

The works were undertaken during the winter period commencing in September 2000 and completed in March 2001 in time for the commissioning of both new vessels on their respective berths. During that period no sailings were cancelled as a result of construction operations.

The photographs indicate the scope of works completed and the close proximity of existing structures to the site works.